Mitsubishi Electric FR-A800, Instruction Manual

Page: 490 / 1042

(H) Protective function parameter Parameters
5 - 310
5.10.9 Limiting the output frequency (maximum/minimum frequency)
Motor speed can be limited. Clamp the output frequency at the upper and lower limits.
For the FR-A820-03160(55K)or lower and FR-A840-01800(55K) or lower.
For the FR-A820-03800(75K)or higher and FR-A840-02160(75K) or higher.
Setting the maximum frequency (Pr. 1, Pr. 18)
●
Set Pr. 1 "Maximum frequency" to the upper limit of the output frequency. If the value of the
frequency command entered is higher than the setting, the output frequency is clamped at the
maximum frequency.
●
To operate at a frequency higher than the 120 Hz, adjust the upper output frequency limit with
Pr. 18 "High speed maximum frequency". (When setting a frequency in Pr. 18, the Pr. 1 setting
automatically changes to the frequency set in Pr. 18. Also, when setting a frequency in Pr. 1, the
Pr. 18 setting automatically changes to the frequency set in Pr. 1.)
Setting the minimum frequency (Pr. 2)
●
Set Pr. 2 "Minimum frequency" to the lower limit of the output frequency.
●
If the set frequency is Pr. 2 or less, the output frequency is clamped at Pr. 2 (will not fall below Pr. 2).
Pr. Name
Initial
value
Setting
range
Description
1
H400
Maximum frequency
120 Hz
0 to 120 Hz Set the upper limit of the output frequency.
60 Hz
2
H401
Minimum frequency 0 Hz 0 to 120 Hz Set the lower limit of the output frequency.
18
H402
High speed maximum
frequency
120 Hz
0 to 590 Hz Set when operating at 120 Hz or higher.
60 Hz
Fig. 5-136:
Maximum and minimum output frequency
I002590E
0
Output frequency
(Hz)
Clamped at the
maximum frequency
Frequency setting
Clamped at the
minimum frequency
Pr. 1
Pr. 18
Pr. 2
(4
5, 10 V
(20 mA)
(4 mA)